Cruising Sailors Forum Archive
Interesting idea.
In Response To: Wouldn't this be great 
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() This Garmin unit might be better for a boat. It uses GPS all the time whereas the Audiovox unit doesn't trigger alert unless it wanders out of range from the base station.
http://www.amazon.com/Garmin-GTU-GPS-Tracking-Unit/dp/B004HFRA7A/ref=lh_ni_t